2b27bdcc20
Based on 1 normalized pattern(s): this program is free software you can redistribute it and or modify it under the terms of the gnu general public license version 2 as published by the free software foundation this program is distributed in the hope that it will be useful but without any warranty without even the implied warranty of merchantability or fitness for a particular purpose see the gnu general public license for more details you should have received a copy of the gnu general public license along with this program if not write to the free software foundation inc 51 franklin st fifth floor boston ma 02110 1301 usa extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 246 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Alexios Zavras <alexios.zavras@intel.com> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190530000436.674189849@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
68 lines
2 KiB
C
68 lines
2 KiB
C
/* SPDX-License-Identifier: GPL-2.0-only */
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/*
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* Generic binary BCH encoding/decoding library
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*
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* Copyright © 2011 Parrot S.A.
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*
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* Author: Ivan Djelic <ivan.djelic@parrot.com>
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*
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* Description:
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*
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* This library provides runtime configurable encoding/decoding of binary
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* Bose-Chaudhuri-Hocquenghem (BCH) codes.
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*/
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#ifndef _BCH_H
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#define _BCH_H
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#include <linux/types.h>
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/**
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* struct bch_control - BCH control structure
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* @m: Galois field order
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* @n: maximum codeword size in bits (= 2^m-1)
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* @t: error correction capability in bits
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* @ecc_bits: ecc exact size in bits, i.e. generator polynomial degree (<=m*t)
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* @ecc_bytes: ecc max size (m*t bits) in bytes
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* @a_pow_tab: Galois field GF(2^m) exponentiation lookup table
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* @a_log_tab: Galois field GF(2^m) log lookup table
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* @mod8_tab: remainder generator polynomial lookup tables
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* @ecc_buf: ecc parity words buffer
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* @ecc_buf2: ecc parity words buffer
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* @xi_tab: GF(2^m) base for solving degree 2 polynomial roots
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* @syn: syndrome buffer
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* @cache: log-based polynomial representation buffer
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* @elp: error locator polynomial
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* @poly_2t: temporary polynomials of degree 2t
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*/
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struct bch_control {
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unsigned int m;
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unsigned int n;
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unsigned int t;
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unsigned int ecc_bits;
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unsigned int ecc_bytes;
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/* private: */
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uint16_t *a_pow_tab;
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uint16_t *a_log_tab;
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uint32_t *mod8_tab;
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uint32_t *ecc_buf;
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uint32_t *ecc_buf2;
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unsigned int *xi_tab;
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unsigned int *syn;
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int *cache;
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struct gf_poly *elp;
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struct gf_poly *poly_2t[4];
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};
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struct bch_control *init_bch(int m, int t, unsigned int prim_poly);
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void free_bch(struct bch_control *bch);
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void encode_bch(struct bch_control *bch, const uint8_t *data,
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unsigned int len, uint8_t *ecc);
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int decode_bch(struct bch_control *bch, const uint8_t *data, unsigned int len,
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const uint8_t *recv_ecc, const uint8_t *calc_ecc,
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const unsigned int *syn, unsigned int *errloc);
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#endif /* _BCH_H */
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